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WikiPedia: Coughs and sneezes spread diseases http://www.euro.who.int/en/health-topics/communica... //doi.org/10.1080%2F10158782.2009.11441366 //doi.org/10.1353%2Fbh.2017.0014 //www.worldcat.org/issn/1015-8782 https://www.goodhousekeeping.com/uk/health/a312624... https://books.google.com/books?id=AT0jAQAAIAAJ https://books.google.com/books?id=iMnN4fZrj70C&pg=... https://www.newspapers.com/clip/44000642/coughs-an... https://uk.news.yahoo.com/wash-hands-rees-mogg-on-... https://muse.jhu.edu/article/674976/pdf